Home › nanno-taxonomy › Nannoliths › Sphenolithaceae › Sphenolithus › S. abies group

Revision of S. abies group from Sun, 16/03/2008 - 00:17

Sun, 30/03/2008 - 19:13 — Jeremy Young
Citation: 
Sphenolithus abies group

Description: Sphenoliths without prominent apical spines.

Species included:

 Typical specimens  Outline description  Range
6-2abies.JPG abies.jpg S. abies - cuspate outline, with apical elements elongated into compound spine caNN7 - NN15
6-5conicus.JPGconicus.jpg S. conicus - with small apical spine Oligocene - NN3
6-15disbelemnos.JPGdisbelemnos.jpg S.disbelemnos -similar to S. belemnos but with very small apical spine NN2-3
6-9dissilimis.JPGdissimilis.jpg S. dissimilis - similar to S. moriformis but with apical cycle of elements extended to form circlet of spines Oligocene - NN3
6-6moriformis.JPGmoriformis_(well_preserved).jpg S. moriformis - beehive shaped Eocene - NN10

Species in this group are poorly defined and of very limited biostratigraphic value.

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